Method and machining tool for cutting workpieces and associated computer program product

Abstract

A method cuts a, in particular flat, workpiece by a cutting beam and a cutting fluid. A workpiece part to be cut away is consecutively cut into at least two smaller portions which fall or are lowered downwards from a surrounding remaining workpiece after they have each been cut away. The division into smaller portions and the execution of the cut for separating the first smaller portion occur such that the point at which the first-cut, first smaller portion is cut away lies within the outer contour of the workpiece part to be cut away.

The invention claimed is: 
     
       1. A method for cutting a workpiece with a cutting beam and a cutting fluid, which comprises the steps of:
 successively cutting a waste workpiece part into at least two smaller waste part portions which directly border each other, the at least two smaller waste part portions separate from a surrounding remaining workpiece after the at least two smaller waste part portions have each been cut away, wherein a division into the at least two smaller waste part portions and an execution of a cut for separating a first part portion of the at least two smaller waste part portions takes place such that a cutaway point of the first part portion, the cutaway point which is cut first, lies inside an outer contour of the waste workpiece part to be cut away, wherein the division into the at least two smaller waste part portions and the execution of the cut for separating the first part portion take place such that the cutaway point of the first part portion lies in a radius about a center of gravity of the first part portion, wherein a circle area delimited by the radius takes up less than ⅓ of a total area of the first part portion. 
 
     
     
       2. The method according to  claim 1 , which further comprises dividing the at least two smaller waste part portions to be cut away by area into the first part portion and a second part portion. 
     
     
       3. The method according to  claim 2 , wherein the division into the at least two smaller waste part portions and the execution of the cut for separating the first part portion take place such that a width of the second part portion is at least as large as a thickness of the workpiece. 
     
     
       4. The method according to  claim 2 , wherein the division into the at least two smaller waste part portions takes place such that the second part portion has two side edges running towards one another from the outer contour of the waste workpiece part to the cutaway point of the first part portion. 
     
     
       5. The method according to  claim 2 , which further comprises making a separating cut between the first and second part portions without angular corners. 
     
     
       6. The method according to  claim 2 , which further comprises making a separating cut between the first and second part portions obliquely such that a lower edge of the first part portion protrudes further into the second part portion than an upper edge. 
     
     
       7. The method according to  claim 2 , wherein when the first part portion is cut away, a partial separating cut is already made between the second part portion and the surrounding remaining workpiece. 
     
     
       8. The method according to  claim 2 , which further comprises subdividing the waste workpiece part into several segments to be cut successively from the surrounding remaining workpiece, wherein at least one of the several segments is divided into the at least two smaller waste part portions to be cut successively. 
     
     
       9. The method according to  claim 1 , which further comprises dividing the at least two smaller waste part portions to be cut away into the first part portion and a second part portion which is surrounded on three sides by the first part portion. 
     
     
       10. The method according to  claim 1 , wherein the division into the at least two smaller waste part portions and the execution of the cut for separating the first part portion take place such that the cutaway point of the first part portion lies in a center of gravity of the waste workpiece part to be cut away, in the center of gravity of the first part portion or in a region between the center of gravity of the workpiece part to be cut away and the center of gravity of the first part portion. 
     
     
       11. The method according to  claim 1 , which further comprises dividing the at least two smaller waste part portions to be cut away by area into the first part portion and a smaller second part portion. 
     
     
       12. A machining tool, comprising:
 a cutting beam; 
 a cutting fluid for separating a workpiece into at least one waste workpiece part and a remaining workpiece; 
 a machining head which can be moved relative to the workpiece and from which said cutting beam and said cutting fluid emerge; and 
 a machine controller being programmed to control a relative movement between said machining head and the workpiece, said machine controller programmed to:
 successively cut the waste workpiece part to be cut away into at least two smaller waste part portions which directly border each other and which fall or are lowered downwards from a surrounding said remaining workpiece after the at least two smaller waste part portions have each been cut away, wherein a division into the at least two at least two smaller waste part portions and an execution of a cut for separating a first part portion of the at least two smaller waste part portions takes place such that a cutaway point of the first part portion which is cut first, lies inside an outer contour of the waste workpiece part to be cut away, wherein the division into the at least two smaller waste part portions and the execution of the cut for separating the first part portion take place such that the cutaway point of the first part portion lies in a radius about a center of gravity of the first part portion, wherein a circle area delimited by the radius takes up less than ⅓ of a total area of the first part portion. 
 
 
     
     
       13. The machining tool according to  claim 12 , wherein the workpiece is a plate-shaped workpiece. 
     
     
       14. A non-transitory computer readable medium having computer executable instruction for performing a method for cutting a workpiece with a cutting beam and a cutting fluid when the computer executable instructions run on a machine controller of a machining tool, the method comprises the steps of:
 successively cutting a waste workpiece part to be cut away into at least two smaller waste part portions which directly border each other and which separate from a surrounding remaining workpiece after the at least two smaller waste part portions have each been cut away, wherein a division into the at least two smaller waste part portions and an execution of the cut for separating a first part portion of the at least two smaller waste part portions takes place such that at a cutaway point of the first part portion which is cut first, lies inside an outer contour of the workpiece part to be cut away, wherein the division into the at least two smaller waste part portions and the execution of the cut for separating the first part portion take place such that the cutaway point of the first part portion lies in a radius about a center of gravity of the first part portion, wherein a circle area delimited by the radius takes up less than ⅓ of a total area of the first part portion.